Electrically-heated oven



March 19, 1929. J. c. WOODSON ELECTRICALLY HEATED OVEN Filed Dec. 1

INVENTOR James C Woaa so/y A'TTORNEY Patented Mar. 19, 19296 UNITED STATES JAMES c. woons'on, or MANSFIELD, 0310,

ASSIGNOR TO WESTINGHOUSE ELECTRIC 8a MANUFACTURING-COMPANY, A CORPORATION OF PENNSYLVANIA.

' ELEc'rBIoALLY-Hnii'rnn oven.

Application filed December 13, 1927. Serial No. 239,662.

My invention relates to electrically heated ovens and more particularly to means for removably mounting heating elements therein.

An object of my invention is to provide an improved means for mounting a plurality of electric heating elements in an electric oven whereby the insertion or the removal thereof, as a unit, into or. from the oven chamber is permitted.-

Another olject of my invention is to provide, in an electric oven, a combined shelfsupport and heating-element mounting, and removable means for securing said structure in operative .position in the oven chamber.

A further object of my invention is to pro vide an improved means for making the electric circuit connections for a plurality of electric heating elements which are removably mounted in an oven chamber.

In practicing my invention, I provide, in conjunction with an oven chamber, a skeleton frame extending over the floor and side walls thereof, a plurality ofshelf-supporting brackets and heating elements secured thereto, and electric contact means, carried by said frame, adapted to cooperate with contact means mounted upon an adjacent furnace wall to energize said elements only when said frame is in operative position.

In the drawings, Figure l is a view, in front elevation, of an oven embodying'my invention, the door thereof being in an open position and partially broken away.

Fig. 2 is a vertical section taken on line 0 IIII of- Fig. 1.

Fig. 3 is a view, in perspective, of the heating-element supporting structure removed from the furnace chamber.

Referring more particularly to the drawing, an oven 2, embodying my invention, comprises a floor, roof, and plurality of side walls defining a substantially rectangular furnace ch amber 4. The floor, roof, and side walls are constructed f parallel-extending sheets of metal having a suitable heat-insulatingrefractory packing substantially filling the space therebetween.' The elements are maintained in operative relation by vertically extending angle irons 8 which project below the level of the oven floor and constitute a support for the oven. v A

The front wall of the oven is hinged to one of the vertical angle irons 8 to constitute a door for facilitating the charging and removal of material with respect to the oven ties thereof. The upper extremities of the angle irons 12 and 14 are connected by angles 18 and 20, respectively, each havin zontal flange extending inwardly rom the a horifaces ofthe vertically extending angle irons 12 and 14.

. The arrangement is such that the angle irons 18 and 20may be moved apart a limited distance, for a purpose hereinafter descr1bed.- I

A plurality of verticall spaced bayonet slots 22 are provided in t e angle irons 12 and 14 and are adapted to be engaged, selectively, by suitable pins mounted upon shelf-supporting brackets 24. The number of pairs of brackets employed, or the relative positions thereof, may be varied, according to the number and arrangement of work-supporting shelves employed. A showing of the shelves has been omitted from the drawing, but it is to be understood thatthey are of the usual sheet-metal construction.

Heating elements 26, of the encased resistance type, are secured to the side and base frames, as indicated more particularly in Fig. 3, and the terminals thereof are electrically connected, respectively, to bus bars 28 and 30.

The bus bar 28 extends along the front angle irons 12 and 14 and beneath the front edge of the base frame 16. The bus bar 30 cooperates with the rear angle irons 12 and 14 and the rear edge of the base frame in a similar manner. The portion thereof extending under the rear edge of the base frame is broken, however, and the ends thereof connected to a double contact plug, shown diagrammatically only, which is adapted to cooperate with a socket 32, mounted in the oven rear wall, to complete a circuit through the heating elements.

When the heating elements have been mounted upon the frame, and the necessary electricel connections completed, the structure may be moved, as a unit, into the furnace chamber. With the structure in position in the furnace chamber, the vertically and horizontslly extending portions thereof are udjscent to the side walls and door, respectively, of the furnace chamber and are substantially coextensive in area therewith. The structure is then secured in operative position by a Wedging ironic 34:, which is forced into position upon the horizontal flanges of the angle irons l8 and 20; The lateral dimensions of the frame 34 are such that, when it is forced into position, it tends to spread the irons 18 and 20 laterally, and to force, thereby, the angle irons 12 end 14 against the side walls of the oven chamber. A desired number of shelves are then posh tioned upon the supporting brackets 24. end the oven is ready for operation.

By my invention, 1 have provided an improved structure for mounting electricol hes ting elements and shelfsupporting brackets in on electrical heating furnace, whereby the structure end heating elements may be moved, as e unit, into or out of an oven chamber and may be removobly secured therein. Also by my in -ention, oil electrical connections of the heate s iney be effected outside of the oven, the heaters are prevented from being' energized until the supporting structure is in operetive position Within the oven. Further, since the heating elements and electricol connections therefor are disposed in the recess defined by the angle irons l2 and i l, the elements are maintained out of contact with the Work being heated and the side Walls of the oven.

Quite clearly, many changes may be made in the structure details disclosed Without departing from the spirit of the invention. For example, the oven structure and shape may be varied Wlllll" wide limits, and electrical renting demerits of various types may be employed.

furious modifications may be made, in my invention, without departing from the spirit and scope thereof, and l desire. therefore, that only such .mitutions shall be placed thereon us imposed by the prior art and set forth in the uppended claims.

I claim as my invention:

1. in an electric oven, means fori'ning u combined sheli support end heating-element mounting comprising :i skeleton l lttlllt extending over the bottom and side walls of the oven chamber, end means for securing said mosses frame in operative position in said chamber comprising means for spreading the side-Wall portions thereof into engagement with the udjecent oven side walls.

2. In on electric even, a skeleton frame substantially covering the floor and a pair of opposed side walls of the heating chamber thereof, means cooperating with the side-Well portions of said frame for removobly securing said frame in seid chamber and moons for mounting a plurality of electric heating elements on said frame.

3. In on electric oven, the combination with s heating chamber end a plurality of electric heating units, of means for support ing said heating units comprising a frame substantially coextensive "with the bottom and side walls of said chamber, means for removably securing said frame in operative position Within said chamber, and cooperating means on said frame and ewell of said even for completing on electric circuit to said heating units.

t. In an electric oven, the combination with a heating chamber and a plurality of resistor elements for effecting the nesting thereof, of means for mounting said elements as a uni-' tery removable structure, comprising a. skeleton frame substantially coextensive in dimensions with the floor and side wells of seid chamber, means for mounting said elements thereon, and means for releasably securing said frame in said chamber.

5. In a combined shelf-support and heating-element mounting for on electric oven, 2". skeleton frame including a base substantially coextensive in area with the area of the floor of said oven and vertically extending portions adapted to extend over the side walls thereof, a plurality of shelf-supporting" brackets edjustebly mounted upon said frame, means for mounting plurality of heating elements upon said frame, and menus cooperating with the vertically extending portions of said frame "for removobly securing said frame in sold oven.

6. In on electric oven, a frame therein substantially coextensive in over-ell dimensions with the chamber of said even, o plurality of heating elements secured thereto, moons for securing said frsme in operative position within said oven chmnber, and means permitting the removal of said frame and elcments, use unit, from said oven.

In testimony wl1erool',liluive hereunto subscribed my name this 2nd day of December, 1927.

Jill-1E5 C. VOODSOL- 

